We use RAID 1 and RAID 10. We have no servers using RAID 5 anymore. RAID 10 is the best for performance and redundancy.

RAID 1 is ok for if you only have two drive servers. RAID 5 is good if you only have room for 3 drives but always go with RAID 10 if your server/raid card/budget can support it.

you an your customers will be very happy.